高等学校化学学报

高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (2): 290.

• 论文 • 上一篇    下一篇

EO/THF无规共聚醚结构研究(Ⅰ)──端羟基液体共聚醚的NMR分析

张建国1, 裴奉奎1, 吴亦杰1, 景凤英1, 张喜田1, 谭惠民2   

  1. 1. 中国科学院长春应用化学研究所, 长春, 130022;
    2. 北京理工大学
  • 收稿日期:1993-04-03 修回日期:1993-09-25 出版日期:1994-02-24 发布日期:1994-02-24
  • 通讯作者: 张建国,男,41岁,助理研究员.
  • 作者简介:张建国,男,41岁,助理研究员.
  • 基金资助:

    国家八六三项目

Studies of EO/THF Random Copolyether(Ⅰ)──NMR Analysis for the Liquid Hydroxy Terminated TEO

ZHANG Jian-Guo1, PEI Feng-Kui1, WU Yi-Jie1, JING Feng-Ying1, ZHANG Xi-Tian1, TAN Hui-Min2   

  1. 1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022;
    2. Beijing Institute of Technology, Beijing
  • Received:1993-04-03 Revised:1993-09-25 Online:1994-02-24 Published:1994-02-24

PDF (PC)

被引次数

13

摘要： 用核磁共振技术研究了环氧乙烷(EO)与四氢呋喃(THF)端羟基液体共聚醚(TEO)的链结构,定量测定了TEO的结构组成参数以及二元组与三元组序列分布。实验结果表明,端羟基液体TEO易形成以E-OH为端基的线型无规交替结构,且序列分布随EO/THF组成比而变化。

关键词: 核磁共振波谱, 序列分布, 无规共聚醚, 链结构

Abstract: In this work, the chain structure of the liquid hydroxy terminated TEOwas described by 1D13C NMR and 2D COSYspectroscopies.Some difficulties in recognition of the 13C spectra of TEOcome from the overlap of peaks or small difference for chemical shifts.The assignment of the peaks in 13C spectra of TEOwas discussed deeply with information provided from 2D H-H COSYand C-H COSYexperiments.The diads and triads distribut ion were determined by the gated decoupling 13C NMR spectrum and based on the change of sequence structure with the content ratio of EO/THF.The four peaks in the high field of 13C NMR spectrum of TEO(50%EO) sample solution in CDCl3, obviously, were assigned to TTT, TTE, and ETE(-CH2-).In the lower field, the six peaks were identified as ETE(71.12 ppm), TTE(71.08 ppm), TEE 3nd EEE(70.85 ppm), EEE(70.55 ppm), EET(70.55 ppm), TTT(70.52 ppm),TTE (70.52 ppm), TET(70.02 ppm), EET(70.02 ppm).The experiment results indicate that the average functionalities(fn) are about 2, and the average alternated degree close to 50 per cent,so, TEO's are copolyether of the random and the alternation.

Key words: NMR spectroscopy, Sequence distribution, Random copolyether, Chain structure

TrendMD: